diff --git a/static/script.js b/static/script.js
index cc539124..dca9d60b 100644
--- a/static/script.js
+++ b/static/script.js
@@ -3726,7 +3726,8 @@ function updateRadarWindow(msg) {
 
   // Always heading-up: player facing direction = up on canvas.
   // Compass labels rotate around the edge based on player heading.
-  const headingRad = playerHeading * Math.PI / 180;
+  // AC heading convention is opposite from standard math angles — negate
+  const headingRad = -playerHeading * Math.PI / 180;
   const compassLabels = [
     { label: 'N', angle: 0 },
     { label: 'E', angle: Math.PI / 2 },